Five new species of dicyemid mesozoans (Dicyemida: Dicyemidae) from two Australian cuttlefish species, with comments on dicyemid fauna composition
Five new species of dicyemid mesozoans in two genera are described from two Australian cuttlefish species, Sepia apama Gray (giant Australian cuttlefish) and S. novaehollandiae Hoyle (nova cuttlefish): Dicyema coffinense n. sp. from S. apama collected from Coffin Bay, South Australia (SA), Australia...
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Veröffentlicht in: | Systematic parasitology 2013-10, Vol.86 (2), p.125-151 |
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Sprache: | eng |
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Zusammenfassung: | Five new species of dicyemid mesozoans in two genera are described from two Australian cuttlefish species,
Sepia apama
Gray (giant Australian cuttlefish) and
S. novaehollandiae
Hoyle (nova cuttlefish):
Dicyema coffinense
n. sp. from
S. apama
collected from Coffin Bay, South Australia (SA), Australia;
D. koinonum
n. sp. from
S. apama
and
S. novaehollandiae
collected from Gulf St Vincent (GSV) and Spencer Gulf (SG), SA, Australia;
D. multimegalum
n. sp. from
S. apama
collected from Cronulla and North Bondi, New South Wales, Australia;
D. vincentense
n. sp. from
S. novaehollandiae
collected from GSV, SA, Australia; and
Dicyemennea spencerense
n. sp. from
S. novaehollandiae
and
S. apama
collected from SG, SA, Australia. Totals of 51
S. apama
and 27
S. novaehollandiae
individuals were examined, of which all except for four
S. apama
were infected by at least one dicyemid species. Dicyemid parasites were also observed in host individuals that were held in tanks for 2–3 months prior to examination, including nematogen-exclusive infections, leading to questions about persistence of dicyemids after host death and the mechanism responsible for the switch between a nematogen phase and a rhombogen phase. Variations in host size, calotte shape and collection locality are explored as predictors of differences in observed composition of the parasite fauna. In particular, dicyemid parasite fauna varied with host collection locality. As these parasites are highly host-species specific, their use as biological tags to assess cephalopod population structure using a combined morphological and molecular approach is discussed. This study increases the number of dicyemid species described from Australian cephalopods from five to ten, and from 117 to 122 species described worldwide. |
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ISSN: | 0165-5752 1573-5192 |
DOI: | 10.1007/s11230-013-9443-6 |